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Primary productivity is measured in term...

Primary productivity is measured in terms of

A

Kg per `m^(2)` per yr

B

g per `m^(2)` per yr

C

Tonnes per hactare per yr

D

All correct

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The correct Answer is:
To answer the question "Primary productivity is measured in terms of," we can follow these steps: ### Step-by-Step Solution: 1. **Understand Primary Productivity**: - Primary productivity refers to the rate at which energy is converted by photosynthetic and chemosynthetic autotrophs to organic substances. It is a crucial concept in ecology as it indicates the amount of biomass produced in an ecosystem. 2. **Identify Types of Primary Productivity**: - There are two main types of primary productivity: - Gross Primary Productivity (GPP): The total amount of organic matter produced. - Net Primary Productivity (NPP): The amount of organic matter available after accounting for respiration by producers. 3. **Measurement Units**: - Primary productivity can be measured in various units: - **Kilograms per square meter per year (kg/m²/yr)**: This unit is often used for larger ecosystems or areas. - **Grams per square meter per year (g/m²/yr)**: This unit is more common in smaller or more specific studies. - **Tons per hectare per year (t/ha/yr)**: This unit is used in agricultural and forestry contexts. 4. **Evaluate the Options**: - Option A: Kilograms per meter square per year (kg/m²/yr) - Correct. - Option B: Grams per meter square per year (g/m²/yr) - Correct. - Option C: Tons per hectare per year (t/ha/yr) - Correct. - Option D: All correct - Since all the previous options are correct, this option is also correct. 5. **Conclusion**: - Since primary productivity can be measured in all the units mentioned in options A, B, and C, the correct answer is option D: all correct. ### Final Answer: **Option D: all correct.** ---
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